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Wanting to add Borax - help needed

I am having such a hard time with the chlorine burning off. My PH used to be ok, but its off as well. I really want to completely turn to BBB - How much Borax and Muriatic Acid should I add? Do I add it gradually?

I have an inground, approx. 23,000 gallon plaster pool with spillover spa. It is very hot and dry here in the desert southwest.

Thank you so much for the link. According to the calculator (which is wonderful). I will need 18 - 76 oz. boxes of Borax and 5 gallons of MA. I just put in chlorine and will test in the a.m. Do I need to have my chlorine at a certain level before adding the Borax and MA? When adding the Borax and MA, do I add it gradually and test in between? I am shooting for Borates of 50, is this good?

You can add the borax and acid any time. The chlorine level should be maintined to keep the pool sanitized but doesn't have any direct relationship with the borax.

Borates of 50 ppm is fine.

You should probably aim for about 40 ppm at first in case the calculation is off a little bit. Let that mix in overnight then test the borax level and see where you are. Then adjust the remaining quantites based on the level you test at that point.

When adding I would add three or four boxes of borax slowly through the skimmer and then a gallon of acid poured slowly in front of a return (all with the pump running), then repeat. Remove the skimmer sock if you are using one before doing this. Wait several hours with the pump running to allow everything to mix in and then test the PH and adjust as needed.

Assuming you gave it enough time to mix, we can call that reading 40 ppm. I would try another 4 boxes of borax and another gallon of acid and see where that gets you. [[Four, perhaps even 4 1/2, boxes of borax because the last gallon of acid will probably have brought the PH down by too much.]]